Figure 9
From: Opto-mechanical lab-on-fibre seismic sensors detected the Norcia earthquake
(a) Map of the Norcia earthquake epicentre retrieved from the INGV official website (http://cnt.rm.ingv.it/, the map is released under a CC-BY-SA licence https://creativecommons.org/licenses/by-sa/3.0/); (b) comparison between the ground displacement traces of the LOF sensors and the reference sensor; (c) photograph of St. Benedict Cathedral in Norcia after the earthquake55; in the inset, a picture of the Cathedral before the earthquake is displayed (the picture is released under a CC-BY-SA licence https://creativecommons.org/licenses/by-sa/3.0/ by Wikimedia56); (d) wavelet coherence between the optical and Episensor displacement signal over a 400 s window.
